JSON Schema Validator

Validate JSON against JSON Schema drafts with actionable diagnostics and workflow-grade error mapping.

All processing happens locally in your browser. No data is uploaded or stored.

Validation mode

Preset

Typical REST payload contract with required fields and format checks. · Tags: api, rest, payload

ProfileSchema DraftGroupingMax Errors

Validate mode: Auto · Policy: warn+continue (recommended)

Shortcuts: Ctrl/Cmd+Enter validate, Ctrl/Cmd+Shift+J focus JSON, Ctrl/Cmd+Shift+S focus schema, Esc clear markers.

Trust Contract: SAFE

Trusted actions: enabled

JSON Input

95 chars

Drag file, click upload, or paste a file from clipboard.

JSON input = the data instance to validate.

Schema Input

460 chars

Preset schema is locked. Click "Edit schema" to enable upload or paste.

Schema input = the rule set used to validate the data.

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "required": ["id", "email", "status"],
  "properties": {
    "id": { "type": "integer", "minimum": 1 },
    "email": { "type": "string", "format": "email" },
    "status": { "type": "string", "enum": ["active", "paused", "disabled"] },
    "tags": {
      "type": "array",
      "items": { "type": "string" },
      "maxItems": 10
    }
  },
  "additionalProperties": false
}

Validation Results

Draft in use: —

95 chars

Drag file, click upload, or paste a file from clipboard.

JSON input = the data instance to validate.

How to Use

Choose Quick preset for fast validation, or Custom schema for full control.
Paste JSON data in the left panel and schema rules in the center panel.
Use grouped results and click any issue to jump to JSON and schema locations.
Export the report only when trust status allows trusted actions.

Frequently Asked Questions

Which JSON Schema drafts are supported?

The validator supports draft-07, draft-2019-09, and draft-2020-12. Auto mode detects from $schema and falls back to draft-2020-12.

Are remote $ref URLs supported?

No. This tool runs in local-only mode and blocks remote refs. Inline and local references are supported.

Does this tool upload my JSON or schema?

No. All processing happens in your browser. No JSON, schema, or validation output is uploaded or stored.

JSON Schema Validator

JSON Input

Schema Input

Validation Results

Which JSON Schema drafts are supported?

Are remote $ref URLs supported?

Does this tool upload my JSON or schema?

Related Guides

JSON Schema — Validate API Data Like a Pro

OpenAPI & JSON — Contract-First API Design

JSON Data Contracts — Schema Governance